Use stylex.props API in readme example

[keeganstreet]

What changed / motivation ?

I noticed that the example code in the readme is using stylex.apply which doesn't seem to exist. Maybe an old version of the API?

Pre-flight checklist

• [x] I have read the contributing guidelines Contribution Guidelines
• [x] Performed a self-review of my code

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[nmn]

Can't believe no one else caught this till now. Thanks!